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Welcome to AX84® the base camp for tube (valve) electronics hobbyists.

AX84 exists to provide:

1) A great environment to learn about music-related electronics in general. AX84 is a place where those with experience are interested in helping diligent beginners who are willing to do their homework.

2) A place where those with more experience can field their ideas to peers and get useful feedback.

3) An environment that respects the past, but is not enslaved by it. INNOVATION IS GOOD (and it didn't die in the 1950s.) There are new things under the sun every day. Move the ball forward!

Our HUGE discussion area is under 'Discussion Forum' to your left.

We are hard at work improving the site- check back often!

Recent Forum Threads
"Adding a gain stage"
Posted By Sirppi on 05/25/2015
So yesterday I finished building a combination of the EA MV120 preamp stage and the KT88 SE 20W power amp. I'd like to add the unused V1a in the circuit to get more gain out of it, since I have no pha...

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"Introduction + what to build ?!"
Posted By Ryan Boeur on 05/24/2015
Hi all,

This is my first post on ax84. I'm up in Vancouver BC Canada, play "professionally" with Fish & Bird ( and Jenny Ritter ( I suppose that's my main occupa...

Discuss this entry
"HO shuts down with a full volume hum"
Posted By Chris Linkous on 05/24/2015
Hi everyone,
This is my first build. HO has octal mod and external bias adjustment. The amp plays fine with very little noise until about fifteen minutes and then it switches to a full volume hum. ...

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"Celestion G12C"
Posted By James Marchant on 05/24/2015
Hi folks,

I've got a couple of G12C prototypes if anyone wants them.

In case you don't know, the C was the immediate predecessor to the G12M greenback. The C was produced for a few months before...

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"Another Tube Reverb Question "
Posted By Alva Goldbook on 05/21/2015
Well, not so much a question, as I'd like the opinion of the board.

So I'm working on a reverb circuit. I'd like to get the kind of reverb that's as rich as found on blackface amps. These circuits...

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Updates: Mon, May 25th, 2015 @ 17:19:18
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Site News

2014-10-21: Be sure to check out our discussion forum using the link on the left..

2014-10-20: The Treasure Fleet is on the way to Rio De La Hacha with a fortune in gold!

We're looking for media clips of recent builds... please stop by the forum and respond to the thread.

2008-10-4: Archived Projects section is functional again.

2008-9-18: RSS Feeds for the forum have been up for a while, but not advertised...
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2008-6-26: Want to participate in our discussion forums? You are welcome to read and lurk as you like. If you think you'd like to post with regularity, please sign up for an account.

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